test: Test that sendall works with watchonly spending specific utxos

Author: achow101

test/functional/wallet_sendall.py

@@ -276,6 +276,33 @@ def sendall_fails_on_high_fee(self):
                 recipients=[self.remainder_target],
                 fee_rate=100000)
 
+    @cleanup
+    def sendall_watchonly_specific_inputs(self):
+        self.log.info("Test sendall with a subset of UTXO pool in a watchonly wallet")
+        self.add_utxos([17, 4])
+        utxo = self.wallet.listunspent()[0]
+
+        self.nodes[0].createwallet(wallet_name="watching", disable_private_keys=True)
+        watchonly = self.nodes[0].get_wallet_rpc("watching")
+
+        import_req = [{
+            "desc": utxo["desc"],
+            "timestamp": 0,
+        }]
+        if self.options.descriptors:
+            watchonly.importdescriptors(import_req)
+        else:
+            watchonly.importmulti(import_req)
+
+        sendall_tx_receipt = watchonly.sendall(recipients=[self.remainder_target], options={"inputs": [utxo]})
+        psbt = sendall_tx_receipt["psbt"]
+        decoded = self.nodes[0].decodepsbt(psbt)
+        assert_equal(len(decoded["inputs"]), 1)
+        assert_equal(len(decoded["outputs"]), 1)
+        assert_equal(decoded["tx"]["vin"][0]["txid"], utxo["txid"])
+        assert_equal(decoded["tx"]["vin"][0]["vout"], utxo["vout"])
+        assert_equal(decoded["tx"]["vout"][0]["scriptPubKey"]["address"], self.remainder_target)
+
     # This tests needs to be the last one otherwise @cleanup will fail with "Transaction too large" error
     def sendall_fails_with_transaction_too_large(self):
         self.log.info("Test that sendall fails if resulting transaction is too large")
@@ -341,6 +368,9 @@ def run_test(self):
         # Sendall fails when providing a fee that is too high
         self.sendall_fails_on_high_fee()
 
+        # Sendall succeeds with watchonly wallets spending specific UTXOs
+        self.sendall_watchonly_specific_inputs()
+
         # Sendall fails when many inputs result to too large transaction
         self.sendall_fails_with_transaction_too_large()